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Accounts receivable, net | 12 Months Ended
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Dec. 31, 2019
Accounts receivable, net |
Accounts receivable, net | 5. Accounts receivable, net
|  | December 31,
|  | 2019 |  | 2018
Trade accounts receivable |  | $ | 23,138,736 |  | $ | 22,331,720
Receivable from OC-BVI |  |  | 10,808 |  |  | 46,600
Other accounts receivable |  |  | 222,381 |  |  | 242,799
|  |  | 23,371,925 |  |  | 22,621,119
Allowance for doubtful accounts |  |  | (142,236) |  |  | (158,902)
Accounts receivable, net |  | $ | 23,229,689 |  | $ | 22,462,217
The activity for the allowance for doubtful accounts consisted of:
|  | December 31,
|  | 2019 |  | 2018
Opening allowance for doubtful accounts |  | $ | 158,902 |  | $ | 158,902
Provision for doubtful accounts |  |  | — |  |  | —
Accounts written off during the year |  |  | (16,666) |  |  | —
Ending allowance for doubtful accounts |  | $ | 142,236 |  | $ | 158,902
Significant concentrations of credit risk are disclosed in Note 21.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- References No definition available. + Details
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